It is possible that the main title of the report Marfan Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
As Jenny points out, being able to lisp the alphabet song at age two has little to do with 'knowing' the alphabet. And, yes, most children learn the letters by sight and sound in kindergarten, although most are capable of learning this information sooner if diligently taught by parents or others.
Eventually, children learn to put together letters and sounds to read words and sentences. Most of us consider children to be reading when they can decode, or sound out, new words on their own. For many children, this stage begins in kindergarten. There are, of course, exceptions, but itâs not necessary to push kids into reading any earlier than theyâre ready.